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HOLMES L NICKERSON,

l Fire Alarm. Y

No. 62,033. v PatentedlFeb. 12, 1867.

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@atten l grafts aient @ffice Josnin nomas AND CHARLES W. NionnssoN, or Pirrssnno, PENN- SYLVANIA. y

Letters Patent No. 62,033, dated .February 12, 1867.

IMPBOVBD BURGLAR AND Filth-ALARM.

TO ALL WHOM IT MAY CONCERN:

Be it known that we, JOSIAH HOLMES and-CHARLES W.NICKEPSON, of Pittsburg, in the county of Allegheny, and State of Pennsylvania, have invented a new, and useful Improvement in Burglar and Fire-Alarmsg and we do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference'being had to the accompanying drawings, forming part of this specification, in which- Figure 1 is a plan of our improved burglar and tire-alarm.

Figure 2 is' a section of the same takenl in the lino a: x, fig. 1.

Figure 3 is a view of a setting pin. i

Similar letters of reference indicate like p'arts. l

This invention relates to improvements in the construction of burglar and tire-alarms, and consists inthe arrangement of devices in connection with iniiammable guard-cords stretched throughout a building,` whereby, I when the guard-cords are burned by fire or bro'ken by the entrance of a burglar through a door or window, an alarm-bell is started, which will awake and notify a person in charge of the building. The advantage of our improved device is simplicity of construction, certainty of operation, and 'provision for relieving the springs fromrthe strain of tension without slackcning the guard-cords attached to them, together with the easy adaptation of the alarm to any number of connections with cords running through extensivebuildings.

A is a small box containing the apparatus of our improved fire and burglar-alarm, which is provided with an ordinary clock or coil-spring, o, alarm-bell, b, and belLhammer, c. Upon the' arbor of the spring a is a spurwheel, d, which engages in a smaller wheel, e, and at the same arbor a ratchetwheel, g, lics beside the spurwheel al, held by the pawl z'. On the arbor of the spur--wheel e is a scape wheel, L, with its pallets,`o o, set on the long pivot k, to which also are fastened the arm c of the bell-hammer c, and a rod, m, that connects with' a plate lever, n, which is pivoted atp to the ,under side of the partition B, within the box A. The free end of the connecting-rod m slips into 'a slot, s, that opens in the side of the plate lever n, in order" to set the alarm, where it is held until a guard-cord is broken, which releases it and starts the alarm by disengaging the-pallets 0 o from the scapewheel 7L in the ordinary manner for operating a clock-alarm. On the upper side of the partition lB are placed a series of. spiral springs, r r, in any required number, which are held in place by loops, t t, through which they pass and move back and forth -loosely when extended or'contracted. At each end yof 'the springs are rings for attaching them at one end to the guard-cords v v and at the other 4end to pins or hooks, w w, when the alarm is set. The guard-cords v v, which extend to any part of a'building, are fastened tov the ends of the springs r r, and their ends v' 'v pass to the under side of the partition B, and are all fastened at one point to' the plate lever n in such manuel' that when the alarm is set and the guard-cords 1) u are stretched the plate lever n, will be thrown back and the endsv v' also be taut, asshown in iig. 2. When the cord and springs are thus stretched and connected with the lever plate n the end of the connecting or catch-rod m is slipped into the slot s to set the alarm with a pin, s, on the end of the lever plate projecting above the partition B. For extending the spiral springs r r and hooking the ends on the pins w w with facility, a little detachedpin, z, fig. 3, is pivoted. f i

,It will be manifest that when the alarm is set, if either of the guard-cords are broken the contraction of the spiral spring, to which it is fastened, will draw upon the end c of lthe broken cord, and thusV move the plate lever 'n forward to release the catch-rod m from the slot s end start the alarm-bell, as above described. It`will also bc seen that when the spiral springsrr are extended the ends may be detached from the pins web to relieve the strain by the free play 'through the loops t t'without starting the alarm or slackening the guard-cords.

Havingtbus described our invention, we claim as new, and desire to secure by Letters Patent- 1. The plate-lever n, with the slot s, in combination with the catch-rodm and scape-wheel h, when arranged and operated in connection with a clock-alarm, substantially as and for the purposes herein described.

2. The guard-cords ov, with\their nds viv', the spiral springs rr, andthe lever plate n, combined, arranged and operating substantially as and for the purposes set forth.

' JOSIAH HOLMES CHARLES W. NICKERSON.

Witnesses:

JAMES M. TAYLOR, Istmo REEsn. 

